The Andy Griffith Show (1960)

S3E28 The Rivals

Opie finds himself smitten with a classmate, only to be heartbroken when he realizes she doesn’t feel the same way. In an effort to cheer him up, Barney invites Opie to spend time with him and Thelma Lou. Initially, this distraction helps Opie move on, but soon he shifts his affections from the girl who rejected him to Thelma Lou, creating a new twist in his romantic adventures.